Departmento de Química, Universidade Federal de São Carlos, CP 676, 13560-970 São Carlos, SP, Brazil.
J Hazard Mater. 2011 Sep 15;192(3):1275-82. doi: 10.1016/j.jhazmat.2011.06.039. Epub 2011 Jul 13.
Constant current electrolyses are carried out in a filter-press reactor using a boron-doped diamond (Nb/BDD) or a Ti-Pt/β-PbO(2) anode, varying current density (j) and temperature. The degradation of the real textile effluent is followed by its decolorization and chemical oxygen demand (COD) abatement. The effect of adding NaCl (1.5 g L(-1)) on the degradation of the effluent is also investigated. The Nb/BDD anode yields much higher decolorization (attaining the DFZ limit) and COD-abatement rates than the Ti-Pt/β-PbO(2) anode, at any experimental condition. The best conditions are j = 5 mA cm(-2) and 55 °C, for the system's optimized hydrodynamic conditions. The addition of chloride ions significantly increases the decolorization rate; thus a decrease of more than 90% of the effluent relative absorbance is attained using an applied electric charge per unit volume of the electrolyzed effluent (Q(ap)) of only about 2 kA h m(-3). Practically total abatement of the effluent COD is attained with the Nb/BDD anode using a Q(ap) value of only 7 kA h m(-3), with an energy consumption of about 30 kW h m(-3). This result allows to conclude that the Nb/BDD electrode might be an excellent option for the remediation of textile effluents.
在过滤压力反应器中进行恒流电解，使用掺硼金刚石（Nb/BDD）或 Ti-Pt/β-PbO(2)阳极，改变电流密度（j）和温度。通过对实际纺织废水的降解，同时进行脱色和化学需氧量（COD）的去除。还研究了添加 NaCl（1.5 g L(-1)）对废水降解的影响。在任何实验条件下，Nb/BDD 阳极的脱色（达到 DFZ 限制）和 COD 去除率都比 Ti-Pt/β-PbO(2)阳极高得多。对于系统的优化水动力条件，最佳条件为 j = 5 mA cm(-2)和 55 °C。氯离子的加入显著提高了脱色速率；因此，仅使用约 2 kA h m(-3)的单位体积电解液所施加的电荷量（Q(ap)），就可以使废水的相对吸收率降低 90%以上。使用 Nb/BDD 阳极仅用 7 kA h m(-3)的 Q(ap)值就可以实现废水 COD 的实际完全去除，能耗约为 30 kW h m(-3)。这一结果表明，Nb/BDD 电极可能是修复纺织废水的绝佳选择。
